How do I use spaceDelimted in SBT?

I am trying to use spaceDelimted in my SBT plugin.

However, the "spaceDelimited" function could not be found. Should I turn it on somehow?

object MyPlugin extends Plugin {

    lazy val testInput = inputKey[Unit]("A demo input task.")

    lazy val mySettings = Seq(
        testInput := {
            val args: Seq[String] = spaceDelimited("<arg>").parsed
            args foreach println
        }
    )

}

      

        
        
        
      

    

The above code cannot compile because "spaceDelimited" was not found ...

How do I get "spaceDelimited" to be found - do I need to include a package?

thank